The Spanish verb 'tender' comes directly from the Latin verb 'tendere', meaning 'to stretch' or 'to extend'. This etymology is quite straightforward, as both the form and meaning have remained remarkably stable from Latin to modern Spanish.

Several common Spanish words share this Latin root, including: 'tendencia' (tendency), which describes how something stretches or extends in a particular direction; 'extender' (to extend), which literally means to stretch outward; and 'pretender' (to pretend or to court someone), which originally meant to stretch or put forward a claim.

Many English words are related to this same Latin root 'tendere'. Some common examples include: 'tend' (as in a tendency to do something), 'extend' (to stretch out), 'intend' (literally to stretch towards a goal), 'pretend' (to stretch something forward, hence to put forward a false appearance), and 'tension' (the state of being stretched). The connection to stretching or extending is visible in all these related words.